This past week most of my graduate students, some staff members and I attended the Society of Vertebrate Paleontology annual meeting in Austin, Texas.  I gave a lecture showing that the dinosaurs Dracorex, Stigymoloch and Pachycephalosaurus are all the same species, but at different growth stages.  This research was done by Mark Goodwin of Berkeley, California and Holly Woodward and I from here at MOR.  In the presentation I showed that Dracorex and Stigymoloch have bone tissues that are only known from juveniles.  Some people disagreed with our findings, but didn't have any evidence to disprove the hypothesis.

This is the correct way to do science--make a hypothesis backed up by evidence and then present it to other scientists to see if they can disprove it.  If they can't disprove it, then we assume that the hypothesis is correct, and we call it a theory.

Study of the inside of the dome of Pachycephalosaurus shows that it couldn't have been used as a battering ram.  These dinosaurs couldn't have butted heads, so the spikes and dome were probably just for visual display.